Falling Down the stairs 3

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Across
  1. 2. A single thin length of something like thread, fiber, or hair, especially when twisted together with others to form a rope or cable.
  2. 4. A machine, especially one powered by electricity or internal combustion, that supplies motive power for a vehicle or for other machinery.
  3. 9. The upper layer of earth in which plants grow, a black or dark brown material typically consisting of a mixture of organic remains, clay, and rock particles.
  4. 10. Acts as a primary medium for plant growth, an element-cycling reservoir, and a major filter for water and environmental waste through structured layers called soil horizons.
  5. 11. A pile of objects, typically ones that are neatly arranged.
  6. 12. The dense, central region of an object, such as a planet, a piece of fruit, or a nuclear reactor.
  7. 13. Any material that is burned or altered to obtain energy, heat, or power.
Down
  1. 1. A large group of animals, especially hoofed mammals, that live, feed, or migrate together.
  2. 2. To bear all or part of the weight of an object, holding it up or keeping it from falling.
  3. 3. A piece of open-meshed material made of twine, cord, or fiber, used typically for catching fish, confining birds, or dividing a tennis court.
  4. 5. A story or statement in general circulation without confirmation or certainty to its facts.
  5. 6. An optical instrument designed to make distant objects appear nearer, containing an arrangement of lenses, or of curved mirrors and lenses, by which rays of light are collected and focused and the resulting image magnified.
  6. 7. A clustered human settlement or community, larger than a hamlet but smaller than a town.
  7. 8. The organ of soft nervous tissue contained in the skull of vertebrates, functioning as the coordinating center of sensation and intellectual and nervous activity.
  8. 10. The ability to do something well, usually gained through training or experience.